software_release.rb

  def self.release_steps(current, new, carrier)
    @upgrade = Array.new
    @all = SoftwareRelease.find_all_by_feature_group_id(current.feature_group_id)
    @all.group_by(&:major).each do |m,ss|
      ss.sort_by(&:minor).group_by(&:minor).each do |n,sc|
        rel=sc.sort_by(&:micro).last
        if rel.applicable_carriers
          @upgrade.push(rel.id) if rel.applicable_carriers.split(",").map{|i| i.to_i}.include?(carrier.id)
        end
      end
    end
    # upgrade is a sorted array, now trim releases before current
    @upgrade.each do |i|
      i_rel = SoftwareRelease.find(i)
      if (i_rel.major = current.major && i_rel.minor == current.minor)
        @upgrade.pop(irel_id)                                             #<--- help here?
      end
    end
    @upgrade
  end